Welcome, and congratulations! How exciting for you! You have chosen a GREAT time to go, too...there's a good chance that weather will be perfect, and crowds will be manageable during the time between Thanksgiving and Christmas!
To Jeff's list, I would add the Candlelight Processional at Epcot. It's the traditional telling of the Christmas story by a different celebrity narrator everynight. A choir and the Voices of Liberty sing traditional carols interspersed with the narration. If you like tradition (can I use that word one more time??) then you will love this. It's included with your regular admission. Mickey's Very Merry Christmas Party is an after hours event held at Magic Kingdom that I hear is wonderful, with a special parade and other nice holiday touches. It requires a separate ticket.
I would also suggest calling as soon as possible if you have in mind any special dinner reservations, as ADRs book quick. Let us know if you'd like any advice about restaurants. We LOVE to eat around here!
OH - and it would seem that you MUST visit the Christmas Shoppe at Downtown Disney to get a special ornament for your tree, commemorating your honeymoon 